Answer:
Option (e).
Explanation:
Mutualism may be defined as the type of a biological species interaction in which both the species are equally and mutually benefited without casing any harm to each other. This is a type of positive interaction.
The measure of mutualism in costs and benefits, the energy spent or gained in mutualism is equal. The mutualism results in the gain of energy for both the individuals.
Thus, the correct answer is option (e).
